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nicorvp, To calculate the stress ratio for Figure 323.2.2B, go back to the basic design formula for straight pipe (304.1.2) and solve for "S" using the minimum pipe thickness less any allowances (usually 0.875*thickness listed in your pipe schedule less any thread and/or corrosion...

I hope I understood your question correctly. PSIG is gauge pressure in psi. Gauge pressure (in psi or psig - the units are identical) plus local atmospheric pressure equals absolute pressure in psi (or psia). Most times one must be careful to understand whether they're working in psia or psig...

prabir, Don't forget to consider the effects of the concentrated loads at your support points. In large diameter, thin wall pipes, sufficient saddles, stiffening rings or other appropriate reinforcement is usually required to prevent local buckling/deformation. These concentrated loads may...

In my experience, nominal diameter is used for determining bend radius.

I've had some fairly significant experience with chloride SSC in 600 psig and 125 psig steam service. If this expansion joint is the one (or one of a few) austenitic stainless steel components in your steam system, the metallurgy upgrade you propose may be the appropriate path. Inconel 625...

You can see what a weldolet looks like on Bonney Forge's website. www.bonneyforge.com Follow appropriate links: Branch Connections to Weldolet (and its various configurations) It's interesting to note that Bonney Forge recently acquired WFI, another maker of (similar) proprietary branch...

We recently discovered cracking in a steel stack that is part of a gas turbine/waste heat boiler unit at a refinery. The stack is only in service when the gas turbine is operating with the waste heat boiler shutdown (i.e. a bypass or auxiliary stack). The stack in question is 9 ft diameter x...

We've used PII (Pipeline Integrity International) to "smart pig" a 20" Crude Oil pipeline, as well as, smaller product pipelines. Type of inspection pig will vary depending on line size (due to technology available). We use MFL (magnetic flux leakage) for the 20" crude oil...

JoePat, You may want to start a new tread on this topic. In any case, it is not uncommon (at least within the refining industry) to have roll expanded stainless steel tubes in a heat exchanger. You should have no problem finding a heat exchanger fabricator with experience rolling stainless...

I believe the changes to Section II were made based on improved design capabilities, manufacturing practices and quality control in fabrication, however, those in this forum that may have been directly involved with the changes can provide a better response to your questions 1 and 2. For...

My experience is on the downstream side. In any case, steam rings are regularly used to temporarily mitigate hydrocarbon leaks from exchanger girth joints (or other flanged joints). If you're having a chronic problem with these exchangers, an upgrade in gasket material is probably in order...

The line operates at about 30 psig. I agree the rate of corrosion will increase due to higher temperatures. However, the time at temperature is very short (the duration of welding) and very localized; so while corrosion rates may be temporarily quite high, I would expect measured metal loss to...

I'm looking at a temporary project option to hot tap "fresh" 98 wt% sulfuric acid lines (material 316ss). Everything I've found in industry literature (API 2201, internal corporate guidelines, etc.) lists sulfuric acid service as a service NOT RECOMMENDED for hot tapping due to hazards...